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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Nexperia USA Inc. BZX384-C12-QX

Name: BZX384-C12-QX
Brand: Nexperia USA Inc.
SKU: BZX384-C12-QX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX384-C12-QX

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: SC-76, SOD-323

Datasheet:: BZX384-C12-QX.pdf

Description:: DIODE ZENER 12.05V 300MW SOD323

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Product details

Overview

BZX384-C12-QX from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 12 V nominal breakdown at 5 mA, with 300 mW total power dissipation and qualified to AEC-Q101 for automotive use. It provides stable reference voltage in low-power biasing, overvoltage protection, and voltage clamping circuits.

For engineers reviewing the BZX384-C12-QX datasheet, BZX384-C12-QX pinout, BZX384-C12-QX application, or BZX384-C12-QX equivalent, this page delivers verified Zener parameters, cathode/anode terminal mapping, automotive-grade reliability context, thermal resistance data, and direct alternative part comparisons for precision voltage reference selection.

Technical Context

This device operates as a reverse-biased silicon Zener diode with a nominal 12 V breakdown voltage at I_Z = 5 mA, differential resistance ≤150 Ω, and temperature coefficient of +6.0 mV/K. Its non-repetitive peak reverse power dissipation is 40 W (100 μs pulse), supporting transient suppression in automotive ECUs and sensor interfaces.

Designed for surface-mount operation on FR4 PCBs with single-sided copper, it exhibits R_th(j-a) = 415 K/W and R_th(j-sp) = 110 K/W, enabling reliable thermal performance in compact layouts. Reverse current remains ≤0.1 μA at VR = 9.4 V, ensuring low leakage in standby regulation.

Key Specifications

Parameter	Value and Actual Design Meaning
Breakdown Voltage V_Z	11.4 V to 12.7 V at I_Z = 5 mA - defines usable regulation window under production tolerance
Power Dissipation P_tot	300 mW at T_amb ≤ 25 °C - sets maximum continuous DC power in standard PCB mounting
Differential Resistance r_dif	≤150 Ω - determines output impedance and load regulation error in reference circuits
Reverse Current I_R	≤0.1 μA at V_R = 9.4 V - ensures minimal quiescent current in high-impedance bias networks
Temperature Coefficient S_Z	+6.0 mV/K - quantifies V_Z drift per degree Celsius, critical for temperature-stable references
Non-repetitive Peak Power	40 W (100 μs pulse) - supports ESD and surge immunity in automotive CAN/LIN node protection
Junction Temperature	−65 °C to +150 °C - enables operation in engine bay and under-hood environments

Pinout & Package

Package: SOD323 (SC-76), plastic surface-mounted, 2-lead, 2.3 mm × 1.35 mm footprint with cathode marked by bar.

Pin/Terminal	Circuit Role	Design Meaning
1	Cathode (K)	Connected to regulated output node; reverse-bias anode-to-cathode voltage establishes V_Z
2	Anode (A)	Connected to ground or lower-potential rail; current flows into cathode during regulation

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive applications including powertrain control modules and body electronics
±5 % voltage tolerance	Cost-optimized regulation accuracy suitable for non-critical biasing and clamping functions
Low thermal resistance to solder point	R_th(j-sp) = 110 K/W enables efficient heat transfer to PCB copper in space-constrained designs
Non-repetitive surge capability	Withstands 40 W transient pulses (100 μs), supporting ISO 7637-2 load dump protection stages
SOD323 footprint compatibility	Standardized 2.3 mm × 1.35 mm outline allows drop-in replacement in existing small-signal diode layouts

Applications

Automotive Sensor Biasing

Industrial Power Supply Clamp

Use Scenario: Providing stable 12 V reference for analog front-end amplifiers in ABS wheel speed sensors.

IC Role / Device Role / Timing Role: Zener voltage reference establishing precise bias point for op-amp input stage.

Use Value: Maintains signal integrity across −40 °C to +125 °C ambient with <±10 mV drift due to +6.0 mV/K coefficient and low r_dif.

Use Scenario: Clamping 24 V industrial PLC I/O line against transients exceeding 30 V.

IC Role / Device Role / Timing Role: Shunt protection element diverting surge current when line voltage exceeds 12.7 V.

Use Value: Limits voltage excursion using 40 W non-repetitive pulse rating, preventing downstream IC damage without requiring active circuitry.

Consumer Device Overvoltage Protection

Automotive LIN Bus Voltage Stabilization

Use Scenario: Protecting USB-C PD controller logic rails from adapter overvoltage events.

IC Role / Device Role / Timing Role: Low-leakage (≤0.1 μA) shunt regulator absorbing fault energy before LDO shutdown.

Use Value: Enables fail-safe behavior with minimal standby current draw and no external control required.

Use Scenario: Stabilizing 12 V supply rail feeding LIN transceiver ICs in door module ECUs.

IC Role / Device Role / Timing Role: Local voltage reference maintaining transceiver V_CC within 11.4–12.7 V window despite battery ripple.

Use Value: Ensures robust LIN communication up to 20 kbps by holding supply within transceiver's specified operating range.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener voltage reference applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX384-B12-Q	±2 % tolerance (11.8–12.2 V), lower r_dif (≤80 Ω), same package and AEC-Q101 rating	Better regulation accuracy for precision analog sensing; higher cost	Select when tighter V_Z tolerance and lower dynamic impedance are required for feedback loops
MMSZ5242B-TP	±5 % tolerance (11.4–12.6 V), 500 mW P_tot, SOD-123 package, not AEC-Q101 qualified	Higher power handling but lacks automotive qualification and has larger footprint	Choose for non-automotive industrial use where higher continuous power is needed and qualification is not mandatory

Compared with BZX384-C12-QX, the BZX384-B12-Q offers improved regulation stability at the expense of tighter process control cost, while MMSZ5242B-TP trades automotive reliability for higher power and non-qualified commercial use-making the C-series optimal for cost-sensitive, AEC-compliant 12 V clamping.

Availability

BZX384-C12-QX is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and consumer power management systems requiring stable component supply with guaranteed long-term availability.

Supply support for BZX384-C12-QX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a leading semiconductor manufacturer specializing in high-volume, high-reliability discrete and logic devices, with core expertise in automotive-qualified components.

The BZX384-Q series belongs to Nexperia's automotive Zener diode product line, engineered specifically for voltage regulation and transient protection in harsh-environment electronic control units.

FAQ

What is the maximum continuous forward current for BZX384-C12-QX?

The absolute maximum forward current is 250 mA per limiting values table. However, forward conduction is not its intended operating mode; it is designed for reverse-bias Zener operation. Continuous forward bias above 100 mA risks thermal overstress due to VF ≈ 1.1 V at 100 mA, generating >110 mW dissipation in the small SOD323 package.

Does BZX384-C12-QX support reflow soldering, and what footprint is recommended?

Yes, it is qualified for lead-free reflow soldering. The recommended footprint matches the SOD323 outline in Figure 12: 0.6 mm pad width, 0.95 mm pad length, 2.2 mm center-to-center spacing, with 0.5 mm solder mask opening per pad. This ensures reliable wetting and mechanical strength without tombstoning.

How does the +6.0 mV/K temperature coefficient affect regulation accuracy over temperature?

At 12 V nominal V_Z, a +6.0 mV/K coefficient causes ~±0.72 V drift over a −40 °C to +125 °C junction range. Combined with ±5 % initial tolerance (±0.6 V), total worst-case variation is ±1.32 V. This is acceptable for clamping but requires compensation in precision references.

Is BZX384-C12-QX suitable for bidirectional TVS applications?

No-it is a unidirectional Zener diode optimized for reverse-bias regulation only. It lacks symmetrical breakdown characteristics or specified reverse standoff voltage for bidirectional surge suppression. For TVS use, dedicated bidirectional devices like PESDxLVSx series are required.

BZX384-C12-QX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BZX384-Q

Package/Case:: SC-76, SOD-323

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 12.05 V

Tolerance:: ±5%

Power - Max:: 300 mW

Impedance (Max) (Zzt):: 25 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 8 V

Voltage - Forward (Vf) (Max) @ If:: 1.1 V @ 100 mA

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-323

BZX384-C12-QX FAQ

1.How can I place an order for BZX384-C12-QX through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX384-C12-QX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BZX384-C12-QX reliable?

The price and inventory of BZX384-C12-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX384-C12-QX is usually 5 days.

3.What payment methods are accepted for BZX384-C12-QX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-C12-QX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX384-C12-QX?

BZX384-C12-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX384-C12-QX order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BZX384-C12-QX?

For technical support, including BZX384-C12-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-C12-QX requirements.

6.How does Aetrix verify that BZX384-C12-QX is sourced from the original manufacturer or authorized distributors?

All BZX384-C12-QX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BZX384-C12-QX meets industry standards.

7.What is the process for return or replacement of BZX384-C12-QX?

All BZX384-C12-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-C12-QX, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BZX384-C12-QX part is unused and in its original packaging.

Return procedure for BZX384-C12-QX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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